Display screen with a graphical user interface



The single FIGURE is a front view of a display screen with a graphical user interface showing the claimed design.

The outermost broken lines illustrate a mobile device, which is the environment of the design, and form no part of the claimed design. The remaining broken lines illustrate the display screen with a graphical user interface and form no part of the claimed design. 

CLAIM The ornamental design for a display screen with a graphical user interface, as shown and described. 